The bulk of your energy costs will be spent heating and cooling your home. Put a dent in that bill with a thermostat that’ll keep your house comfortable when you’re home to enjoy it, and saves energy when you’re not. You’ll spend less than $100 for a basic model, and can save as much as $180 per year.

Irrigate your lawn for free with a rain barrel, which can save 1,300 gallons of water and lower your water bill by about $35 per month in the summer. You’ll spend $35 to $200 on a commercial barrel, or you can save more money by making one yourself from castoff food-grade containers. A 55-gallon syrup drum is about $10.

Creosote, birds’ nests, and other debris can clog your chimney, causing a home fire risk, but an inspection will sweep those problems away. A level-one inspection, in which the inspector will look for damage and remove obstructions, will cost anywhere from $79 to $200.

These lights, which plug into ordinary wall outlets, provide a security boost by illuminating your home’s exterior when anything moves outside. They take minutes to install and cost anywhere from $13 to $105.

If disaster strikes, you’ll be ready: Document your escape routes, designate a meeting place in case family members are scattered, and assign a “communication commander” who will relay messages between loved ones. Don’t forget to include your pets!

is an Atlanta-based writer and editor. She believes no effort is too small when it comes to green living, which she tries to keep in mind while renovating her recently purchased first home. Follow Courtney on Google+.